Video Parameter Set Bitrate Signaling for Hybrid Scalability
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Solution Overview
Problem
The increasing popularity of digital media poses challenges in efficiently representing, storing, and rapidly playing back high-quality content, particularly in terms of bitrate and picture rate management in electronic devices.
Innovation Solution
A method for decoding a video bitstream involves receiving a base bitstream and enhancement bitstreams, along with a video parameter set containing syntax elements that signal bitrate and picture rate information, allowing for selective signaling of these parameters based on external or internal specification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bitrate and picture rate information are always externally signaled, then accuracy and completeness of video parameters are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent changes the signaling state of bitrate and picture rate parameters between external signaling and internal specification based on video parameter set conditions. When the video parameter set indicates certain conditions are met, the system switches to internal specification mode, reducing processing complexity while maintaining parameter accuracy through derived calculations.
Solution Approach 2:
The system performs self-service by internally specifying bitrate and picture rate parameters based on derived information from the video bitstream itself, rather than requiring continuous external signaling. The decoder uses the video parameter set and bitstream structure to self-determine these parameters, reducing dependency on external signaling mechanisms.
2Device complexity
If all video parameters are internally specified, then device complexity is reduced, but measurement precision and completeness of video parameters deteriorate
Solution Approach 1:
The system dynamically changes between external signaling and internal specification modes based on the video parameter set conditions. This allows the system to maintain parameter accuracy when needed while reducing complexity when external signaling is not required, optimizing the trade-off between precision and complexity.
Solution Approach 2:
The system applies partial internal specification rather than complete internal specification for all parameters. It selectively specifies bitrate and picture rate parameters based on the video parameter set conditions, applying internal specification only where appropriate and using external signaling where necessary, thus avoiding excessive complexity while maintaining sufficient accuracy.
3Productivity
If bitrate and picture rate are selectively signaled, then processing efficiency is improved, but reliability of parameter information may worsen
Solution Approach 1:
The system uses the video parameter set as feedback information to determine whether to externally signal or internally specify bitrate and picture rate parameters. This feedback mechanism ensures that parameter specification is reliable by base decisions on the actual video content characteristics, while maintaining processing efficiency through selective signaling.
Solution Approach 2:
The system changes the parameter specification approach based on video parameter set conditions, switching between external signaling and internal specification modes. This dynamic parameter change ensures reliability by selecting the appropriate specification method based on the actual video characteristics, while improving processing efficiency through selective rather than mandatory external signaling.
Data Source
AI summary
This invention relates to a method for decoding a video bitstream comprising the steps of: (a) receiving a base bitstream representative of a coded video sequence; (b) receiving at least one enhancement bitstreams representative of said coded video sequence; (c) receiving a video parameter set containing syntax elements that apply to said base bitstream and said at least one enhancement bitstreams where said syntax elements selectively signaling bitrate and picture rate information for said base bitstream based upon whether said base bitstream is externally signaled or internally specified.